Display a notice type of box

To help promote anonymous posters to post questions, I’d like to put up some sort of permanent notice information box above the forums to display said message.
Any ideas what file/code I need to be playing with, as a start?

Thanks Lynq.
Hmm, tried creating new topic twice in last 12 hours and they’ve failed to appear so no idea what’s going on on these forums.

Anyway, slightly different question. Any idea what file and location I need to insert code into so that something appears after the Topic and before the reply? I want to start inserting Ads in that location using Simple Ad Manager and have a code snippet I need to insert.